Code critique

A tripcode calculator for 4chan (ver 0.5)

criticisms and suggestions welcome
http://pastebin.com/wHGMwJdB

ver2 will be a threaded trip code explorer
ver3 will be a CUDA trip code explorer

>>4
>>5
Salt was originally a dynamically allocated string because I thought the length of salt depended on the length of the input. When I realised this wasn't so I just modified the malloc statement. Lazy of me.

>printf("mango");
That's just some stupid debug code.

>>6
I'm aware of the special character and UTF-8 encoding shortcomings. Any ideas about how to use UTF-8 in C and converting SJIS?